All the neurons in our brains transmit electrical signals. The exchange of signals generates heat. The heat could be indirectly reduced by blood circulation. However, the nasal cavity and paranasal sinuses are more direct mechanism that can dissipate the heat, functioning as a cooling fan in a computer. The heat generated from the brain while carrying out the vital functions to sustain life is cooled off by the air ventilation inside the nasal cavity and sinuses. That is to